Rock-drilling machine.



. GROSE.

Patented ocn.1'9,199. s SHEETS-SHEET 1.

um R wwf@ w l 'III J. B. H ROCK DRILLING MACHINE. APPLIUATION FILED MAY e, 1907.

J. E. H. GROS'E. Roux DRILLING MACHINE. lAPPLICATION FILED MAY 8, 1907.

Patented oct.1l9,1909.

J. E. H. GROSE. ROCK DRILLING IYIAGHINEl APPLIUATION FILED MAY a, 1907.

Patentedoct. 19, 1909.

3 SHEETS-SHEET 3,

'JAMES EDWARD HosKINs saosn, or GERMIsToN, TRANsvAAL.'

noeK-DRILLI'NG MAcHrNE.

Patented Got. 19," 1909.

Application filed May 8, 1907. Serial No. 372,625.

To all 'whom 'it' may concern:

Be it known that I, JAMES EDWARD Hos- KINS Gnosr., a subject of the King of Great Britain, and resident of Germiston, Transv Vaal, have invented certain new and useful -as hereinafter fully .described and l out in-the appended claims.

Improvements in VRock-Drilling Machines,l

which the following is a specification.

,*i'iiThis invention vrelates to the valvelesspiston-hammer type ofrock-drill or rockdrilling machine actuated by compressed a1r o r other fluid pressure, and has for its object to simplify the construction and increase the efficiency of such drills or machines.

The invention consists of the several novel features in the construction of the machine pointed I will at once proceedfwith a detailed description of thel invention by aid of the accompanying drawings, in which- Figure 1 is a longitudinal section of the machine, on the lare z-z of Fig. 7. Fig. 2 is a longitudinail section of a portion of the power .cylinder on aA plane represented by the line w-- Fig. 7, a portion of the receiver casing being broken away. Fig. 3 is a View similar' to Fig. 2 the plane of section of the power cylinder being represented by the line 1/-3/ of Fig. 7. Fig. 4 is a transverse section of Figs. 1 and 9 on the line .a-a. F ig.` v.f3-is a transverse section of Figs. j l and 9 on the line b-b. F1g.'6 1s a transverse section of Figs. l and 9 on the line c-c. Fig. 7 is atransverse section of Fig. 1 on the line d-CZ. section of Fig. 1 on the line e-e, and Fig. 9 is a longitudinal section of the front end of the machine, drawn to an enlarged scale. 1 represents a cylindrical receiver casing in which the power cylinder is able to move longitudinally in a forward or rearward direction. l The pow-er cylindergcomprises two tubes or cylinders 2, 3, the Vone 3` concentiically disposed around the other 2. The outer cylinder 8 may be shrunk or otherwise fixed around the internal cylinder 2.

The external cylinder S-see Fig. l-'at its rear extremity isa constructed with an external screw-thread and over it is screwed a cap 4 formed with an internally ,screwthreaded cylindrical projection 5 at the ba ck.

.- Into this internally threaded rearward projection '5` is screwed a back guide tube 6.l

The iaek guide tube '6 may as shown be close at its-rear extremity, and i'sl provided with a. square projection 7 (or it may be a Fig. 8 is a transverse` screw-threaded projection) for a handle or crank for rotating the power cylinder through the medium of the back guide tube G. Screwed over the rear extremity of the receiver casing 1 is a piece 8 which forms a guide for the back guide tube 6 and through which. guide 8 said tube may slide longitudinally in either direction within certain limits.

The guide. 8 is constructed on the inside, as shown at 9, to make a sliding fit around the guide tube and in the outer end of said lguide. 8 beyond the annular projection 9 which makes the slidingv lit with said tube, is a recess in which is placed suitable packing 10 surrounding the back guide tube 6;

11 is a gland screwed into the open end of the guide 8. In the guide 8 is formed a screw-threaded hole 12 for making connection with the hosepipe which serves for conveying the operating fluid into the receiver casing 1. As shown in Fig. 8 a plurality of such inlets may be provided,.any one o f which may be used for oiling the machine, and so that the operating [luid supply pipe may be connected to any one as may be most convenient according to the position of the receiver casing l, theinlets 12 notin use being closed by tight-fitting screw plugs.

The rear Guide 8 ma bealso rovided withsurroundingl the cylinder is located packingv which is retained in position by means of u flanged ring 16 ittn'igsaid recess 15. This lianged ring 1G 1s held 1n position by means of another ring 17 which as shown is secured between the guide ring 14 and the forward end of the receiver casing 1v. .The ian ed .ring 16 serves, in a manner to be hereina er explained, to close the operating fluid inlet ports to the power cylinder just before the cylinder reaches the end of its forward .stroke 'to automatically put the machine out of operation. The front guide ring 14 is also preferablyy constructed with recesses'18 similar to the back guide 8,- for the reception vof a tool for screwing it/'onl to or o` the receiver casing 1 when assembling the' parts or taking them asunder.

In the forward end of the powerv cylinder 2 is fitted a bushing 19 formed with an external annular lian e 20 at the forward end abutting thevend o the cylinder. The forward end of the cylinder is constructed with an external screw-thread, and over it is screwed a cylindrical member 21 forming a front head. The front head 21 at its rear endv is constructed with a hollow flange 22 in which are formed a number ofholes 23 which constitute the exhaust ports. These exhaust ports 23 are directed toward the front of the'machine so that they prevent the sludge as it comes from the bore-hole being thrown on to the machine or operator.

The main exhaust ports hereinafter referred to communicate with the interior of the hollow lian e 22 from which the exhaust issues by the a orementioned holes 23.

The drill holder comprises a hollow cylindrical member 24 which is constructed with a shank or rearward projection 25 which projects into the bushing 19. The shank 25 slightly exceeds the length of the bushing 19 so that it extends fora short distance into the bore of the cylinder 2 beyond said bushf ing. On its inner end the shank 25 receives lthe blows of the hammer piston and transmits the same directly to the drill holder A24 and drill 26. Around the rear end of the cylindrical member 24 and at .the forward end of the shank 25 of the drill holder 24 is formed an annular projection 27. The bush-A ing 19 is non-rotatably connected to the cylinder 2 andthe drill holder 24 is nonrotatably connected to the bushing 19 by means of pins 28, see Figs. 1, 9, and 5, engaging recesses in the end of the cylinder 2 and flange 27 of the drill holder A24, which ins 28 pass through holes in the flange 27 o thc bushing 19; other suitable means may be employed for non-rotatably connecting these parts.

In an annular space in the front head 21 forward of the flange 27 on the rear end of the Adrill holder 24 is located a metal washer 29 andra rubber, spring, or other resilient packing ring 30 for taking the blow of the piston hammer in case the drill is not in position to' receive it.

At the bottom of the hole in the drill holder 24 is placed a cylindrical piece 31, of hardened steel or other suitable metal, against which the inner end of the drill 26 a uts when in position, as seen in Eigs. 1 and 9. -This piece 31 is retained in position in the holder 24 by means of a bushing 32 which is screwed into'the drill holder 24.

-The hole in the bushing 32 is made of the same shape, as the drill steel 26 or that por` tion thereof projected intol the holder 24. The ordinary octagonal drill steel may be used or steel of any other suitable polygonal lsection, so that the drill 26 is rotated with the drill holder24. A hole 33 is formed iongaaainaiwf als dan aga "2e for perniitting the passage through it of water to prevent the formation of dust and also to allow a quantity of the operating fluid to pass with and. convey the water and remove the cuttings from the cutting end of the drill.

' In the piece 31 are formed two oppositely coned communicating recesses 34, forming a j restricted passage or ejector throat- 35 through which the operating fluid and water pass to the drill steel. In the bottom of the drill holder 24 beyond the piece 31 is formed an annular recess 36 which communicates with the larger conical recess 34 in the rear end of the piece 31. From this annular recess 36 ports 37 communicate with an annular recess 38 formed between the flange 20 of the bushing 19 and the forward end of the shank or rearward projection 25 of the drill holder 24. -This latter annular recess 38 is placed in communication through radial ports 39 in the flange 20 with another annular recess 40 between the front head 21 and the flange 20 on the bushing 19. The annular recess 40 communicates through holes 41-see Figs. 1 9 and 5, formed in the front head 21 withan annular recess 42 in a water supply ring 43 arranged around the front head 21 and in which ring 43 the front head 21 may rotate. The water ring 43 is constructed as at 44, te make connection with a water supply ipe along which the water may be drawn rom any suitable source of supply to the interior of the water ring 43 from which it passes by the passages 41. 40, 39, 38, 37, to the annular recess 36 in the holder 24, and from the. latter through the ejectJ-r throat or restricted passage 35 in the piece 3l to the longitudinal hole 33 in the drill steel 26.

The water ring 43 is retained in position by means of a nut 45 screwed on the front` end of the front head 21. In a recess formed between this nut 45 and the front head 21 and abutting the water supply ring 43 is a washer 46 and a. helical or other suitable spring 47 to keep the water supply ring 43 in position on its seat around thefront head 21 and to prevent the escape ofA water. The retaining nut 45 for the ring 43 is coilstructed with recesses'48 for the reception or a tool for screwing it on or ott the front head 21.

Transversely of the shank or rearward projection 25 of the drill holder 24 is formed a hole 49 which communicates with another port 50 formed longitudinally of said shank 25 opening at its forward end into the larger coned recess 34 in the inner or rear end of the -piece 31. The transverse hole 49 communi- Cates-with an annular recess 52 formed between the shank 25 of the drill holder 24 and llt) quantity of the operating fluidl to pass through the shank 25 of the drill holder 24 to draw the water and convey it along `the steel 26.

Thehammer piston 58 consists of a cylinldrical member adapted to be reciprocated in the bore of the cylinder. It is constructed at. the forward end with a'portion 59 ofreduced diameter which strikes the inner end of the,l drill holder shank 25 when the machine is in operation. The piston hammer 58 is constructed at the center with an annular recess 60 which serves for controlling the distribution of the operating iiuid. As pre viously explained said operating fluid passes into the receiver casing 1 through the rear guide 8. The feeding of the drill is effected through the medium of said operating fluid by the pressure thereof on the power cylinders 2, 3, in a forward direction exceeding the pressure in a rearward direction, owing to the diameter of the power cylinders 2, 3, exceeding the diameter of the back guide tube 6.

Two main inlet ports are provided shown consisting of grooves 61 formed betweenthe concentric cylinders 2, 3, and placed in communication at the rear end of the cylinder with the interior of the receiver casing 1. lIn the inner of the two concentric cylinders 2, 3, are formed for each main inlet port 61, three holes 62 which place said main inlets in communication with the annular space 60 formed around the center of the piston hammer 58. In' the normal running of the machine the live operating fluid is always present in the annular recess60 in the piston hammer 58 through oneor other of each of the three holes 62.

Longitudinally of the cylinder and extending for a suitable distance from the rear end in the direction ofthe center, as seen in Figs. 2 and 7, are formed two other ports 63 which lead from the annular space 60 in the piston hammer 58 to the back end ot' the cylinder, and longitudinally of the cylinder at the forward end andextending for a suitable distance 'tqward the center, are two other ports 64 Whichlead from the annular space 60 in the piston hammer 58 to the forward end of the cylinder. These ports 64 are so posi- 'tifoned 'that thepiston hammer 58 overruns the center before the air is permitted to pass to the front end of the cylinder, this to insure an lunimpeded blow on fthe forward stroke of the piston hammer 58.

Twoiot ,er ports 65, see Figs. 3, 6 and. 7,`

are forme" in the power cylinder which constitut'e the exhaust ports Tand are placed in communication with the power cylinder at 66 forthe front end of the cylinder and at 67 for the rear end of the cylinder. These exhaust ports 65, as previously described,

exhaust through the holes 23 in the hollow flange 22 of the front head 21, 68 being holes iii-the outer concentric cylinder 3 placing the forward end of said exhaust ports in communication with said hollow flange 22, see Figs. 3 andr 6. The exhaust ports 65 communicate with the rear end of the cylinder in such a position that the full pressure maintained at the back of the piston hammer 58 until just before the piston hammer 58 strikes the shank 25 of the drill holder 24.

In addition I provide two small auxiliary exhaust ports, one 69 for the back and the other.70 for the front end of the cylinder. slightly in advance of the exhaust ports 66. 67. In the cylinder I also provide auxiliary inlet. ports 7l, 7 2,l leading to the front and back ends of the cylinder. These auxiliary ports 71, 72, are positioned' slightly in advance of the inlet ports 63 and serve in conjunction with the auxiliary ports 69, 70' for starting the piston hammer 58 in case it comes to rest in such a position that the several inlet and' exhaust ports are closed.

In the bore of the cylinder at the rea-r end, see Fig. 2', I provide grooves 73 which allow a quantity of the operating fluid to pass; to the back end of the cylinder'when the piston hammer 58 is at the extreme back end of the cylinder.

The operation-of the machine is as follows -In Fig. 2 the piston hammer 58 is lshown traveling, as indicated vby the arrow,

on its forward and percussive stroke. The operating fluid is passing from the receiver casing l., ports 6l and holes 62, to the annular space 60 around the piston hammer 58, andv the ports63 are open to the annular space 60, allowing the operating iuid to pass into'the cylinder at the rear of the piston'to I impel it on its forward stroke. At the same time the forward ports 64 are closed to. the recess 60 and the ports 66 are placing the cylinder in front of the piston hammer 58 in communication with the exhaust ports 65, and the exhaust from the front end of the cylinderis passing along ports ..65 through holes 68 to the interior of the hollow Hange 22 and vout. through the forwardly directed holes 23.

. In Fig. 3 the piston hammer 58 is shown commencing, .as indicated by the arrow, its rearward stroke after striking the shank 25 of the drill holder 24. In this position the ports 664 placing the interior of the cvlinder in communication with the, exhaust ports 65, are closed by the piston halmner 58 and the ports 64 are open to the annular recess 60 in the hammer 58 so' that the operating lui is passing to the, front. end of the cylinder and impelling the-piston on its rearward stroke. At the same time the ports 67 are placing theI rear end of the cylinder in communication with the exhaust ports 65. 4As the rearward stroke of the. piston hammer 58 continues it closes the"5rs 671;:t'itlie rear end of the cylinder, opens ports 66 to the forward end of the cylinder, closes ports 64C to the annular space 60 and opens ports 63 to said annular space 60 and permits the operating fluid to pass to the rear of the piston hammer 58 to again impel it on its forward and percussive stroke.

In the event of the piston hammer 58 traveling to the extreme back end of the cylinder a sufficient quantity of the operating fluid ca'n pass along grooves 73 to the back of the piston hammer to start it on its outward stroke. Should the piston hammer stop lat or about the center of its stroke, sufficient of the operating fluid can pass through either of the small ports 7l or 72 to start the piston hammer, the small auxiliary ports 69 or 70 providing for the exhaust from the opposite end to that at'which the operating fluid is admit-ted through ports 71 or 72.

Then the cylinder reaches the limit of its forward movement in the receiver casing l, the flanged ring 16 by closing the inlets to the main inlet ports 61, shuts olf the operating fluid supply to said latter ports and so automatically puts the machine out of operation.

That I claim as my invention and desire to protect by Letters Patent is:-

1. I 1,1 a rock-'drilling machine, in combination, a power cylinder having exhaust ports communicating with the exterior thereof at the forward end, a cylindrical piece fixed to the front end of the cylinder, said cylindrical piece having a hollow flange which incloses the exhaust ports, and the hollow flange having holes in the front which form the exits for the exhaust, as set forth.

2. In a rock-drilling machine, in combination, a power cylinder comprising the two concentric tubular members 2, 3, providing between them the exhaust ports 65 for both ends of said cylinder, and a cylindrical member Q1 having. screw-threaded engagement with the front end of the power cylinder, said member 21 having at the rear end a hollow flange 22 through which are formed the forwardly directed ports 23, the outer cylinder 3 having the ports G8 placing ports (35 in communication with said hollow flange 22, as set forth.

In a rock-drilling machine, in combination, a receiver casing, a power cylinder slidably supported in said casing, a piston hammer controlling the distribution of the actuating iuid within the cylinder, a cylindrical piece fixed to lthe front end of the power cylinder for supporting the tool holder, a tool holder and tool arranged therein, said cylindrical piece having a hollow flange, the power cylinder having exhaust ports and also ports placing the exhaust-ports in communication with said hollow flange` and the hollow flange having holes through which the exhaust escapes in a forward direct-ion to direct the exhaust away from the operator and to prevent the sludge issuing from the hole bein thrown back on to the machine, as set fort 1.

4. In a rock-drilling machine, in aembination, a power cylinder, a tool holder, positioned at the front end thereof, the cylinder and holder having ports for permitting a quantity of the actuating fluid to pass there- 75 through to the tool, a tool having a longitudinal hole and a piece positioned between the tool and tool holder, said piece having an ejector throat, and means placing said ejector throat in cou'miunication with a source of water supply.

5. In` a roclt-drilling machine, in combination, a power cylinder, a tool holder carried at the .forward end of said cylinder, said tool holder having a rearward projection to receive the blows of the hammer piston, a tool positioned in the tool holder, said tool having av longitudinal hole, a piece positioned in the bottom of the tool holder at the rear of the tool, said piece having an ejector throat or two oppositely conedcommunicating recesses, means for supplying water to said throat and means for permitting a quantity of the actuating fluid to pass to the throat to convey the water alongr the hole in the tool, as set forth.

(i. In a rock-drilling machine, in combination, a. power cylinder and a hammer piston therein, a tool holder havinga rearward projection projecting into the forward end ot' the cylinder to receive the blows of the hammer piston, thc said rearward projection having a transverse hole which is in communication with the main inlet ports in the cylinder, the projection also having a 105 longitudinal hole communicating with the inner end of the tool holder, the tool holder having an annular recess in the bottom thereof around the aforesaid longitudinal hole, a water ring surrounding the tool holder said 1.10 wafer ring communicating with said annular recess, a piece positioned in the bottom of the tool holder having an ejector throat or two oppositely coned communicating recesses, the one larger than the other, the 115 larger communicating with the annular recess in the bottom of the tool holder, a, bushing in the tool holder having a bore of polygonal cross section 'and a tool having a longitudinal hole and made'of a cross sec- 120 tion corresponding to the hole in the bushin to insure rotation of the tool with the tool holder, land means for non-rotatably connecting the tool holder with the cylinder, as set forth. u l

7. In a rock-drillin .machine, in combination, a power cylin er,"'a piston hammer therein, a front head secured at the front end of the power cylinder, a tool holder sup- .ported by the front head, said tool holder 130 having a rearward projection to receive the blows of the hammer piston, a water supply ring encircling the front head, a nut screwed on the .front head, a spring medium between said nut` and water supply ring and serving as a retaining device fory the latter, as set forth. l

8. In a rock-drillin machine, in combination, a power cylin er, a piston hammer therein which controls the distribution of the actuating fluid, a front head screwed on the front end of the power cylinder, a bushing in the forward end of the power cylinder, said bushing having an external flange and forming an annular recess between said ian'ge and the inside of the front head, a

water supply ring mounted on the front head and in which the front head may rotate, said front head having ports placing the annular recessin communication with the water supply ring, a tool holder in the front head comprising a hollow cylindrical member constructed with an external ange and a rearward projection projecting into and beyond the bushing in the cylinder, said rearward projection having a transverse hole and a longitudinal hole communicating therewith and opening into the tool holder, the

vtool holder also having an annular recess 1n the bottom thereof, which recess is placed in .communication with an annular recess formed between the flange of the bushing and said rearward projection, the bushing having holes placing the transverse hole in the rearward projection in communication with ports communicating with the main let ports in the power cylinder, packin between the flange around the holder an thev front head and pins non-rotatably connect-9 ing the tool holder, bushing and power cylinder, a cap screwed on to the front end or' the front head, a washer and sprlng medium bev tween said cap and water ring for making a liquid tight joint between the water ring and front head, a bushing in the tool holder formed with a bore of transverse polygonal section, a piece positioned. at the bottom of the holder beyond the bushing, said piece having an ejector throat or two oppositely coned connnunicating recesses, the rear one exceeding the diameter of the front one, said rear conical recess communicating with the annular recess in the bottom of the tool holder and with the longitudinal hole in the rearward projection, and a hollow tool positioned in and rotatable with the tool,holder, as setI forth.

ln witness whereof l have hereunto set my hand in the presence of two subscribing witnesses. A

' JAMES EDWARD HOSKINS G RO'SE.

Witnesses:

GHAs. GVENDALE,

' 'f R. OVENDALE. 

